Filtering XML

• The XMLFilter interface is like an XML reader, "except that it obtains its events from another XML reader rather than a primary source like an XML document or database. Filters can modify a stream of events as they pass on to the final application."

• The parent is the parser it gets the data from.

• Only two methods in the interface:

  public void      setParent(XMLReader parent)
  public XMLReader getParent()
  

• XMLFilterImpl is a default filter that simply passes along all events it receives:

  public class XMLFilterImpl implements XMLFilter, EntityResolver, DTDHandler, ContentHandler, ErrorHandler

• Only new methods are constructors:

  public XMLFilterImpl()
  public XMLFilterImpl(XMLReader parent)